Abrasive pad



- Dec. T10, 1957 R. w. BERNSTEIN ABRASIVE PAD 2 She ets-Sheet 1 Filed Feb. 17, 1956 wmw RUSSELL W. BERNSTEIN INVENTOR. BYMGCW HIS ATTORNEY Dec. 10, 1957 R. w. BERNSTEIN 2,815,617

ABRASIVE PAD Filed Feb. 17, 1956 I 2 Sheets-Sheet 2 FIG. l2

RUSSELL w. BERNSTEIN INVENTOR.

Isl WW HIS ATTORNEY ABRASIVE PAD Russell W. Bernstein, Culver City, Calif., assiguor to Merit Products, Inc, Culver City,- Calif., a corporation of California Application February 17, 1956, Serial No. 566,212 13 Claims. (Cl. 51-194) This invention relates to an abrasive pad.

It is an object of my invention to provide an abrasive pad having a plurality of angular corners which are adapted to fit within grooves and depressed areas for light grinding and polishing purposes.

It is more particularly an object of my invention to provide such a pad which may be formed from a single piece of abrasive material which is folded upon itself to form a pad having a plurality of layers and which retains its shape without adhesive or other fastening means being required.

ited States Patent 1 lines indicated in dotted lines;

plan view showing the first fold t is a further object of my invention to provide such a pad in which each corner and part of the pad comprises a plurality of layers of abrasive material, the grain of which extends in different directions. H

In its preferred embodiment, my invention contemplates a pad which is formed by folding a single length of abrasive carrying material upon itself a number of times to form a multi-cornered abrasive pad, with the outer free end of the length of abrasive material being disposed beneath one or more of the adjacent layers forming the pad.

Another object of my invention is to provide an improved and simplified method of mounting such a multilayer abrasive pad for high speed rotation. It is accordingly an object of my invention to provide such a mounting means which is simple and economical and which renders the pad easy and rapid to remove and replace.

Toward this end, it is a particular object of my invenlayer abrasive pad is mounted on an externallyvscrew threaded rotatable member by means of the layers of the pad itself engaging the screw threading of the rotatable member, thus eliminating the use of any screw threaded member in the pad itself.

It is a further object of my invention to provide a mounting means in which a multi-layer pad is mounted ing means in which the mounting member is provided with a slotted head. A staple is applied to the pad so that its midportion lies within the slotted head, while its ends extend through one or more layers of the pad and r are bent over to attach the pad to the mounting member.

It will be seen that my invention provides advantages of economy and simplicity of construction and manufacture, together with improved abrasive action. It is accordingly an object of my invention to provide an abrasive pad having all of the advantages and benefits of the construction described herein. My invention also comprises such other objects, advantages and capabilities as will later more fully appear and which are inherently possessed by my invention.

While I have shown in the accompanying drawings preferred embodiments of my invention, it should be understood that the same are susceptible of modification tion to provide a mounting means whereby such a multiing member or adhesive.

and change without departing from the spirit of my invention.

Referring to the drawings,

Fig. 1 is a side elevational view of my five-cornered abrasive pad, rotatable member and arbor, with parts shown in section;

Fig. 2 is a top plan view of my five-cornered pad, with the rotatable member extending therethrough;

Fig. 3 is an enlarged partial sectional view showing the engagement between the layers of my abrasive pad and the screw threading of the rotatable member;

Fig. 4 is a sectional view of my pad mounted on a stud;

Fig. 5 is a top plan view of a three-cornered pad;

Fig. 6 is a bottom plan view of the length of material from which my abrasive pad is formed, with the fold Fig. 10 is a bottom plan view showing the fourth fold in forming a five-cornered pad;

Fig. 11 is a bottom plan view showing the fifth fold in forming a five-cornered pad;

Fig. 12 is a top plan view of a six-cornered pad;

Fig. 13 is a perspective view showing a mounting member with a slotted head and staple together with my fivecornered pad;

Fig. 14 is a sectional view of the same with the mounting member and staple extending through the pad.

A preferred embodiment which has been selected to illustrate my invention comprises a single length 10 of substantially flexible cloth, coated on one side thereof rial. The length 10 has two ends, which may be referred to as the inner end 11 and outer end 12.

In order to form a five-cornered abrasive pad, the length 10 is first folded upon itself at an acute angle in the manner shown in Fig. 7 of the drawings. The length 10 is then folded in the opposite direction, as shown in Fig. 8 of the drawings. The folding is continued in the paper or the like, which is manner shown in Figs. 9 through 11 of the drawings until a complete five-cornered pad has been formed. The

folding is then repeated until a pad of the desired thickness is completed.

It will be noted that the inner end 11 is disposed adjacent the center of the pad. The outer end 12 is tucked beneath one of the layers formed by the preceding folds and is held in place thereby. The pad is thus held together without any adhesive or fastening means of any kind being required.

In connection with the folding of this five-cornered pad, the fold marks extend at opposite angles with respect to each other along the length 10, as shown in Fig. 6 of the drawings.

In addition to the five-cornered pad shown and described, my abrasive pad may also be formed haviiig three or any greater number of corners desired. Fig. 5 of the drawings shows a three-cornered pad which has been formed from a single length of abrasive carrying material, with the outer end 12a of the length from which it is formed being tucked under one of the preceding layers so that the pad will hold together without a fasten- A six-cornered pad is shown in Fig. 12 of the drawings, tucked under one of the preceding layers.

While it is possible to form my multi-layered poly onal pad with any desired number of corners, it may be noted that a pad having an odd numberof corners 1 plan view showing the second fold with suitable abrasive matei with the outer end 12b being such as three, five or seven is preferable for the reason that such a pad does not have openings along its side edges. In the folding of the abrasive material upon itself, the side edges are closed instead of being left open. The layers of a pad having an odd number of corners are also better arranged at the center of the pad for passing a mounting member through the pad.

It will be noted that regardless of the number of sides and corners which my abrasive pad may have, it is easily and quickly formed by merely folding a single length of abrasive carrying material upon itself a plurality of times. The free outer end of the length of material is then tucked beneath one or more of the layers formed by the preceding folds to prevent unfolding of the pad.

It will also be noted that the folding of the abrasive material at various angles results in providing corners comprising a plurality of layers of abrasive material, the grain of which extends in different directions. This provides improved abrasive action in use.

In order to mount my abrasive pad for high speed .rotation, I provide a rotatable member 1'3 having external screw threading 14. The pad may be provided with a central aperture 15, which is smaller than the head 16 of the rotatable member 13. The diameter of the aperture 15 is preferably less than the outer diameter of the screw threading 14 and substantially equal to its root diameter. When the rotatable member 13 is inserted into the aperture 15 by rotary motion, the layers of the abrasive pad will then engage the screw threading 14 to hold the pad firmly on the rotatable member 13. This construction is shown in Figs. 1-3 of the drawings, in which it will be seen that the edges of the layers extend into the screw threading 14. My abrasive pad accordingly requires no internally screw threaded member within the pad to hold the pad together or to mount it for rotation.

The end of the rotatable member 13 opposite from the head 16 is adapted to fit into complementary internalscrew threading 17 of an arbor 17a which is connected to a suitable source of high speed rotation.

Since my abrasive pad holds itself together without fastening means of any kind, it may be furnished to the customer by itself without an aperture therein or with an aperture therein or mounted on the rotatable member 13.

Instead of the rotatable member 13, I may provide a stud 18, as shown in Fig. 4 of the drawings, which has at one end thereof external screw threading 19 which is complementary to the screw threads 17 of the arbor 17a. The stud 18 is provided with a circular flange 20 which is adjacent but spaced from the opposite end thereof. The flange 20 fits against one side of the abrasive pad, while the stud 18 extends through the center of the-pad. The end of the stud is then bent outwardly as shown at 21 by peening or other suitable means to mount the pad on the stud 18. I may also provide a mounting member 22 as shown in Figs. 13 and 14 of the drawings, which comprises'a screw having external screw threading 23. The end of the screw threading 23 is adapted'to be attached to the screw threads 17 of the source of rotation. The mounting member 22 is provided with a head 24 having a transverse slot 25. The mounting member 22 is inserted through the center of the pad so that the head 24 is disposed adjacent one side of the pad. The head 24 may be countersunk int-o the pad adjacent the center thereof. A staple 26 is then applied so that its midportion 27 is disposed within the slot 25. The ends 28 of the staple 26 extend through the pad and are bent over on the opposite side from the head 24 to attach the pad to the mounting member 22.

The staple 26 may also be used in combination 'with the screw-threaded mounting shown in Figs. 1*3'of the drawings.

It will be noted that the staple 26 locks the abrasive pad to the mounting member 22 and-prevents anyro'tapressed areas for light grinding and polishing purposes.

' When the abrasive pad is worn out, it can easily be removed and replaced.

It will be noted that all of the embodiments of my invention are symmetrically balanced with respect to the central aperture 15, so that they are adaptable for high speed rotational use.

I claim:

1. An abrasive pad having a plurality of layers and a plurality of corners, said pad being formed from a single length of abrasive carrying material, said length being folded upon itself a plurality of times to form a plurality of'layers, said length having an outer end, said outer end being disposed beneath at least one of the adjacent layers formed by the preceding folds, so that said pad is held together without fastening means.

2. An abrasive pad having a plurality of layers having a plurality of corners, said pad being formed from a single length of abrasive carrying material, said length being folded upon itself a plurality of times to form a plurality of layers, said length having an outer end,

' said outer end being disposed beneath at least one of the adjacent layers formed by the preceding folds so that said pad is held together without fastening means, said pad having an odd number of corners, with the material being folded upon itself around each side of the pad so that all of the side edges of the pad are closed.

3. An abrasive pad having a plurality of layers having a plurality of corners, said pad being formed from a single length of abrasive carrying-material, said length being folded upon itself a plurality of times to form a plurality of layers, said length having an outer end, said outer end being disposed beneath at least one of the adjacent layers formed by the preceding folds so that said pad is held together Without fastening means, said pad having five sides and five corners, with the material being folded upon itself around each side of the pad so that all of the sideedges of the pad are closed.

4. An abrasive pad having a plurality of layers and a plurality of corners, said pad being formed from a single length of abrasive carrying material, said length being folded upon itself a plurality of times to form a plurality of layers, said length having an outer end, said outer end being disposed beneath at least one of the adjacent layers formed by the preceding folds, so that said pad is held together without fastening means, and a stud 'extending through the center of said pad, the portion of said stud disposed within said pad having external screw threading, the layers of said pad extending into said screw threading and being engaged therewith to mount said pad on said stud.

5. An abrasive pad as defined in claim 4, one end of said stud having external screw threading for attachment thereof to a source of high speed rotation.

6. An abrasive pad having a plurality of layers and a plurality of corners, said pad being formed from a single length of abrasive carrying material, said length being folded upon itself a plurality of times to form a plurality of layers, said length having an outer end, said outer end being disposed beneath at least one of the adjacent layers formed by the preceding folds, so that said pad is held together without fastening means, said pad having a central aperture extending therethrough, a stud having external screw threading, the outer diameter of said screw threading being greater than the diameter of said aperture, the root diameter of said screw threading being substantially equal'to the diameter of said aperture,

ture, with the layers of :said pad extending into said screw threading and being engaged therewith to mount said pad on said stud.

7. An abrasive pad having a plurality of layers and a plurality of corners, said pad being formed from a single length of abrasive carrying material, said length being folded upon itself a plurality of times to form a plurality of layers, said length having an outer end, said outer end being disposed beneath at least one of the adjacent layers formed by the preceding folds, so that said pad is held together without fastening means, said pad having a central aperture extending therethrough, a stud extending through said aperture, said stud having an enlarged portion disposed adjacent each side of said pad to hold said pad on said stud, one end of said stud having means for attachment thereof to a source of high speed rotation.

8. An abrasive pad having a plurality of layers, said pad having a central aperture extending therethrough, a mounting member having external screw threading, the outer diameter of said screw threading being greater than the diameter of said aperture, the root diameter of said screw threading being substantially equal to the diameter of said aperture, said mounting member screw threadedly extending through said aperture, with the layers of said pad extending into said screw threading and being engaged therewith, said mounting member having a slotted head, and a staple having its midportion disposed within said slotted head, the ends of said staple extending through said pad and being bent over on the opposite side thereof to attach said pad to said mounting member.

9. An abrasive pad having a plurality of layers, said pad having a central aperture extending therethrough, a mounting member extending through said aperture, said mounting member having a slotted head, a staple having its midportion disposed within said slotted head, the ends of said staple extending through at least one of the layers of said pad and being bent over to attach said pad to said mounting member.

10. An abrasive member having a central aperture extending therethrough, a mounting member extending 40 through said aperture, said mounting member having a slotted head, a staple having its midportion disposed within said slotted head, the ends of said staple extending through at least a portion of said abrasive member and being bent over to attach said abrasive member to said mounting member.

11. An abrasive pad having a plurality of layers and a plurality of corners, said pad being formed from a single length of abrasive carrying material, said length being folded upon itself a plurality of times to form a plurality of layers, said pad having an odd number of corners, With the material being folded upon itself around each side of the pad so that all of the side edges of the pad are closed.

12. An abrasive pad having a plurality of layers and a plurality of corners, said pad being formed from a single length of abrasive carrying material, said length being folded upon itself a plurality of times to form a plurality of layers, said pad having five sides and five corners, with the material being folded upon itself around each side of the pad so that all of the side edges of the pad are closed.

13. An abrasive pad having a plurality of layers and a plurality of corners, said pad being formed from a single length of abrasive carrying material, said length being folded upon itself a plurality of times to form a plurality of layers, said pad having a central aperture extending therethrough, a stud having external screw threading, the outer diameter of said screw threading being greater than the diameter of said aperture, the root diameter of said screw threading being substantially equal to the diameter of said aperture, said stud screw threadedly extending through said aperture, with the layers of said pad extending into said screw threading and being engaged therewith to mount said pad on said stud.

References Cited in the file of this patent UNITED STATES PATENTS 2,370,490 Rice Feb. 27, 1945 2,608,804 Field Sept. 2, 1952 2,700,852 Field Feb. 1, 1955 

